It's rare that Smokey has to alert me to this as I usually make him pee before we do anything. And the back door is usually open when we're hanging out downstairs, inside.
The only time really is if we've slept a long time & I'm still in bed but he wants to go out, he'll kinda whine/growl and sit at my bedroom door. But this is pretty rare because usually after sleeping for a long time I'll get him up, take him out, and then back to bed. Heh.